I have to warn you before you make the same mistake I did!! If your heat light for your brooder and/or coop is shatter proof it will kill your birds!! Shatter proof light bulbs are coted with teflon, when teflon is heated it emits a gas deadly to all birds!! some company's have warnings on box but most do not. You can find more info online. Bottom line = DO NOT USE SHATTER PROOF LIGHT BULBS!!!!!!!